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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed8a04cac9c7d7c32ee6a0b9a8d165d2db96666cf2257dfbdeaeae9bee062c39' 
  AND token = 'xtbvxdgvL37OnEMz20CcfiRT58z8g/E7mk+S+v4Tb+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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