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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ccfdb6ebb05e28723b66d8f47cebfb9d3faa76c16666ab608e790f32f17947' 
  AND token = 'ypzf5lTjShFVlVN7ZJb2gPc0juj8z1CS/D4fq+Z2uHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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