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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c86f10039dd391da2b924b7f277849a20f258475beff0d9bf1e803e3938019e9' 
  AND token = 'hnEfQUei3nXrvRMhsWfVWQdcNVeu0Kx1j7vLqHkultI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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