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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c539ec936bee3e0b2e71f0b4a141a4e7217fd5a9241dc7754b62fc7e0c816b' 
  AND token = 'zbHZOhPFwhbFe5k0wqVxtfoJS1Tv0OTEn0/qasm1Udk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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