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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a86bdc146313343b38a6117f5612d2ee3584ebf7a454f84cd57fe1044d286bc1' 
  AND token = 'QFhTBEjnC6BQVk0/D06aZLxCMODf/cRx59GCnGFOjiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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