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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e06337db7d3b4231e1be566d2e021715c50cbeb184acd29797c2bf349064e71c' 
  AND token = 'rj1cV6ms/JOHWRf3PCR/2Nbzvd2VALmwOT2J4ZxGmCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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