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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aca84c763e9844d3a3bf1cbcf7effc0c5b2995e34628e0d167213447ee52f760' 
  AND token = 'yYApvI/OAtKk85OWZ5rfxiBQScdhDW3PxmFR4TGEIOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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