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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '787cda2a9259fe3c7cf9f548480ef6e7c123228883a415624f6cee65b6dcf148' 
  AND token = 'R6FitKIoMZ0jp7asoZyYsqKgV4D5Gu6NZvEu2WK23X8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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