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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edd2a4ea1d1aa02d9e6bd22ff232a7e9b317713e9fefd6bc50c5a403840d5fc7' 
  AND token = 'aQwxG0LQXSTWFaM16YssjyBGKkvexfnJYtUiYS7nZ0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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