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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e037599ccf91d2d2b944c1e23910a355456fd50384b93efd368190adec53cce' 
  AND token = 'J55xERPAqKDdf5r5lJi90g1GlvSJ0O5/GmHzNYZtrhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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