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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ef2c3d29765d0da6ae21b26f678efa6ce1a8f3a4d655449224f2b7a0f5e2be5' 
  AND token = 'Ma9Ggg2Cmz/Z0/vkpIOWjen/N5954eXz5zWdIqSGyZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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