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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '170ddee4bbbda68522b1ef88108a2ab11b9e41e9ed84ed822896e216aa87afbd' 
  AND token = 'sPinSv6qkMpzn2CU2QuRCJ0TDxPx5k7BwayagJzx7oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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