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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c97a94191d0f9eb8bb2e73b1f4a5fe941c97a18335a6207f0f9fc6bf8ee77e0' 
  AND token = 'Q6s7i5xEAf548HwrgedUVPw58GgXpvczeqbihmb/ubI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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