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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4361a12c2d3a25afb4de6d37b8ceae508b4ecad16ea1fb7a2afefb1d3f33676' 
  AND token = 'NNCeYLivPlLDQ1lR4vgq0dtmEvHlI6bjjO2M64QK66U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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