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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aca1ea1dc1ce5a54aa3f031bbad9ad5da584d18ce0f85e86a5a9ed233a57a92' 
  AND token = 'M9b0p57e/m3RPxkRVLz13+o2J2Du7vTeidNFZIMz8A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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