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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebaf9b72d3b895d7e446fdc79e04f56ba83ee186363ce3790580954e5e454093' 
  AND token = 'aZDI7f+JktvMGmU0w7bLscF1TgTY8LieUxO7pEoK5E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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