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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ad37fd998d2dae1673f3776879897c5d53c23e9a13a9cf23ecdf76581eabe1e' 
  AND token = 'mvANyf6WtIUKOg+e6UzB8Ydi5qGLcVCCE6kWsnuKUcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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