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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e2846b7ebc8c3c0f1e079293cc83b0c68bc3070fa1826fe383a15b28e1011a5' 
  AND token = 'tp3OWKbrcsd150Qt246t6krqKF9bDUWttrqIfEMEdlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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