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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28833482f256bafed5f8d47b9ce494696ee10b9888f4b60200e5434b0590dc7a' 
  AND token = '/zRZZWTvFQ8Xr8MNhCscSadUuvvUWV706iOGUiyJxWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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