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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96383596f68c34ea7476da451cf05559b8d2da0d37dc2a8356997a38ac4c28fa' 
  AND token = 'PWGPhmS5ET64b4z3T3eAQalQTRr1rN/R7xADrNJeEqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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