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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ded93189b8c087c244c6b2c822699c23d740a2db7a6a25a3c83939da95ac522f' 
  AND token = 'ALHcCiDj7byQ3y7WSG14/NqbfrTWpXaaQIz0uIjvWXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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