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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd310c1f5b21cda1dacd18e5b71376906c46523cc37724bdd8df91aafe9f91967' 
  AND token = 'fHbb2Xk4ji+DrIlEm7+guvGrwFXYdLFSC8PMXZSXXDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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