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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3caa69116e30f899c3be0f3b8c614f33ffc0ff5f77f385ff5857c3afc692393' 
  AND token = 'MTGMoAOGGlFWRyS4Z0zyRKr4DgosQ2/2yRigYsRi6Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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