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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2afdae036fc6d4e943d67207a1fdb3f8539c6b9598f48564e5926cd0127243be' 
  AND token = 'K/3Wykf56U8pkNa4vv1GlKGkw/8Fyk7PuLhGNq/mFGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}