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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b2ea48cf4f1f17ef44d46ca0fbd7fe2925d9227bfc5a463e2dd5a27ebd1df5' 
  AND token = 'Pu/g05GAEB8WVcNhuoW6rRIumm8Ury/qMt/D5QDHRFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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