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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d9cb87f348e7463a5fcf9d3536d98887aa756f07ac2a9ebdc11575ee03eed7' 
  AND token = 'QTmd3IFE4bLdeG9WWFZ4fXJJEmjdiDxylwmyGwLoEb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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