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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ebdb31ec519d80e70205498f706804ad2f0cb641e004f29878249a25c9ef6f' 
  AND token = 'zM9nc+Bw359L9UjfclR91D/hzeHVUeyp34XL3yT4GTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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