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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4cec610f728c105ed407ebf3ec4facdcc01c1b1aec6b5b0350c1ea07c3e0fd' 
  AND token = 'J1k+VaP77GZ4Zb7ocCe7KNaqjI0725lHyuVd663Uolw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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