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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76de5862111132789be8efdb86987e2ad368930dc9ca0a205cff3a47fe47cc47' 
  AND token = 'Wkz2Hr6KaA7305TKqUyrVS80KrAA9ZzokFAWRFN3MeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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