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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5771984358e0d8c59cab2a4e020b85fcfc8a3a8063631e20181a8d13389e31f' 
  AND token = 'K8/7JciNzNXJX6p/UP54GDf8DdJzVLWvnGO2k9m0rJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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