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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a6ec947ed982ef3be5618671b25f9f69b277670a4498d92951aabfad515190' 
  AND token = 'OUZDHoyx3QaJeU4m9+vLMR8LxVU9nUtNQ8yKjlub1m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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