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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7018b430d5253f33d9979fde9e29b618abd2088dcca9d924e06141d09ccb31d3' 
  AND token = 'pq1B4WsuBX9vtPnPj0/A5oBUSjjWTrtgvpaDnDxwaBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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