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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2579b5a3ed4a5d276d43a6a6fef7172ff69196745698a2cbc6ebdab3af152115' 
  AND token = 'uyItWFgFUXj3iqo/TaakludKwbmR8oD4dVY4PIao3YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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