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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba77156f9b4fbbcab65032b211591924b41798bf699eaa4f544ce1ffffa6254' 
  AND token = '5aTPjiEoLVfgb6ZOLA8QJ3oPDgBKK/9fcfvPBUW/VDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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