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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c73f329b9805b58caec11b64259be320696bba24eabe2d179f92d0fa82909561' 
  AND token = 'RFBfVAXuwMyCPz6po8NDc9oi2eyGWvttefmgrtrlxCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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