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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e2b54e095655e25ecbfe01552f1d0df8a244dae8e053594e37bb06668b1e72b' 
  AND token = '1mhRojMPj7lAtigA2h+KEQLNKyS0aYw7batD7qCQruM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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