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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d6797b977f430773c747838872fe5d1ef2e44c6911252ed77834727e2ec4dff' 
  AND token = 'XMC3kOXi0yUHElyP0+RHPN4I1mTJByVZKRP9v3kGrMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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