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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2124e68f2e5c976d3d2fc2e9a49324d6d66e6030f1c5a999cedd05201a7d16a' 
  AND token = '9LQpR62hPoYneeYXVSENGO+1XTOlYBJKO0urjrD+mMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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