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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58741212b5ee5fa7b19dfb04ff205e9bc8e4f5851ddc96d69ae6d23280091896' 
  AND token = 'SZSKHPP2fCvSSac/DmXvVAVv6hFIjuHz4IDki9yXH78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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