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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae45713137361e858005b3f6aab01cc51a4f2d4b2e12ca2e3e859b60ad79af5' 
  AND token = 'bXunAh0KoekrWGQUoVuoNP/kmWuPGAChMxvf2i9kkqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00166

JSON explain

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