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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d89ef4d05a168de1e099eec13e49e9af683ebaabb3a9709f477205bce1c1577' 
  AND token = 'llmQbeDySENGuGsDYJ0rdm4Ah6U7YjyvQuPgJd+sSro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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