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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c52a30d16f1548c0092dc5a3f80c66cd5318f68cd2c8acb9e9e6dac0c94dbe5' 
  AND token = 'YirT8r4tAoq0LFCuwSqFTJPZyRT9O9PvlYx5IJyRXX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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