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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1356c7e40c2cf1a340ad18d1b352db577c113ce3ec244c4df12e1eabb296c17' 
  AND token = 'nvfYPni+BIs6A6C3kNMjtSOHghV3gIhmzAQHo0QXCD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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