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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '882a642b838f20c4051e27127cb5e74fb30352d0eb6d81b1f551be1cd9f2c29e' 
  AND token = 'dGauKcY5R7VffIC2JA7RI5/4n2Tfyf1/pwHaW00xaR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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