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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76e2162a37fe6099c7f024768c23f8b7ad45b6862515aac1585b9cfc4f4afb66' 
  AND token = '/ksGl8jLNsjy8wEdy84W6V28dcOXORPribaR8Qv9+RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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