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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '487ab10032c5f34daab50dd60eac0ae6aaf6a724b4e038b2535e688e21b7e530' 
  AND token = 'tKjQaSfPqefkd2GA1i52YO3W1JtXIm/Fun9lx5AW0WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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