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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da9373a2b3dfe512820ea9880fcc76233808de2a028fb9d074638a5544265c8f' 
  AND token = '11d2gY786r0xzbtquOTAoAnlBKwIug9wIW4b36inwXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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