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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636264b2e90b709cf0e6a5d80e08d8fcb6b3704790672c598a5ef44f857f60a4' 
  AND token = 'me02pdawXQKxri6ykDshULBqj2DhAPNd2SKkfA/TH2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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