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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04a1c6717d9554450074839928147cae9b6ca49288a2aa41466ac43605959d91' 
  AND token = 'R2Ww1xNrTzuwUfkp5AjRKucltfKtSnwpMjs+G/AGNiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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