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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4fba4e910858ce8d36c5c38ddbc174ccf429101d5bd740b9de2f0d82fc5e529' 
  AND token = 'VV9VeiZH78rLvteFzECaoz/tXdsPLe28gXI9+zFd8y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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