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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33c2d27bc88083e819815e9a6975d8a912cee706d5735796f263731efa59093' 
  AND token = 'onRDXY8bpr826IOPy/8JiJwljx/JnciE3oSdG9LSDh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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