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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ce93aa6d64814072d3ac0f390d8cdf1e078ad004e2e258e00dfece827939f8' 
  AND token = '4Ct74So59wE0FG3ESZ1olZmP49M0DJJm9Mc9DNbUKPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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