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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '556bda176832b09cc78322dc30bb737c3f91ca6fb31d2925f79ae8eb1ae1795b' 
  AND token = 'SjHnFF8+N6LN5FdifyZ2nahF7/DeAYoiFtW1LypQky0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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