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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03f5dd2c9238741727171ad46b6681dab22473a0682b4284eb3a840286cc0f91' 
  AND token = 'DdvqMCUty0l2bKgN/HO/QtiG9NREs5XegrL1g1h0g2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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