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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ccc3eb89392d2d033d8214e943fbdaa7699c23b7fe6670759d5254c91399034' 
  AND token = 'ZwhINABnmyB9FStEJALcnUkxcrhsFlavkhLerdXV7fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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