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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94416ad51406fa70713ad4c0f8a3cd1c5bb68705f90abff59a958aa57523918' 
  AND token = 'UY35HNhMtikJEwQ2SEgUpe1p22W6dZv2Lf3JTC2OXtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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