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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '127a8c3910d9de1c3c5f9bbfd8db5d5e7a479985d1ddc789478535be7c2b6237' 
  AND token = 'qDUpGIs4ak2ZjHMqIRO7yONJjgaCETma6kiQiguqTHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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