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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afad2e5e1d2726ddee0a958bd44fb45f36225e40b1be28534c0cf7944d9463e3' 
  AND token = '0dL3HTSmACsapF9VaOTjYYfRVplaBRcoGMMHpyLw8j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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