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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba2a7e4a7ed98971ab791e721f761c6ecdd7ee6b7239eac3716ac6a455deae1' 
  AND token = 'hpbNkmfDtu9C1H+c8H+RnceotU3kxdvBFiRLv5Jc/cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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